Mark 14:30
And Jesus said to him, "Truly I tell you, today, in fact this very night, before the rooster crows twice, you will deny [knowing] me three times."
Mark 14:66-72
Now when Peter was in the courtyard downstairs [i.e., from where the Sanhedrin was having its meeting. See verse 55], one of the head priest's servant girls came in,
John 13:38
Jesus answered him, "Will you [really] die for me? Truly, truly, I tell you, before the rooster crows, you will deny [knowing] me three times."
Matthew 26:69-75
Now Peter was sitting outside in a courtyard and a servant-girl approached him and said, "You also were with Jesus, the Galilean."
Luke 22:34
And Jesus said, "I tell you, Peter, you will deny [even] knowing me three times before the rooster crows today."
Luke 22:54-62
Then they arrested Jesus and led Him away to the head priest's house [i.e., Caiaphas. See Matt. 26:57]. But Peter followed Him from a distance [i.e., as they went to the head priest's courtyard].
John 18:17
So, the slave-girl gatekeeper asked Peter, "Are you not one of this man's disciples, too?" "[No], I am not," Peter replied.
John 18:25-27
Now Simon Peter had been standing and warming himself [by the outdoor charcoal fire]. So, someone asked him, "Are you not one of His disciples, too?" Peter denied it, saying, "[No], I am not."
1 Corinthians 10:12
So, the person who thinks he is standing firm [in the faith] should pay attention [to his life], so that he does not fall [away from God].